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Entropy 2019, 21(2), 148; https://doi.org/10.3390/e21020148

The Radial Propagation of Heat in Strongly Driven Non-Equilibrium Fusion Plasmas

1
Laboratorio Nacional de Fusión, CIEMAT, Av. Complutense 40, 28040 Madrid, Spain
2
Departamento de Física, Universidad Carlos III de Madrid, Av. de la Universidad 30, 28911 Leganés, Madrid, Spain
*
Author to whom correspondence should be addressed.
Received: 13 December 2018 / Revised: 30 January 2019 / Accepted: 1 February 2019 / Published: 5 February 2019
PDF [1612 KB, uploaded 5 February 2019]

Abstract

Heat transport is studied in strongly heated fusion plasmas, far from thermodynamic equilibrium. The radial propagation of perturbations is studied using a technique based on the transfer entropy. Three different magnetic confinement devices are studied, and similar results are obtained. “Minor transport barriers” are detected that tend to form near rational magnetic surfaces, thought to be associated with zonal flows. Occasionally, heat transport “jumps” over these barriers, and this “jumping” behavior seems to increase in intensity when the heating power is raised, suggesting an explanation for the ubiquitous phenomenon of “power degradation” observed in magnetically confined plasmas. Reinterpreting the analysis results in terms of a continuous time random walk, “fast” and “slow” transport channels can be discerned. The cited results can partially be understood in the framework of a resistive Magneto-HydroDynamic model. The picture that emerges shows that plasma self-organization and competing transport mechanisms are essential ingredients for a fuller understanding of heat transport in fusion plasmas.
Keywords: magnetic confinement fusion; turbulence; heat transport magnetic confinement fusion; turbulence; heat transport
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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van Milligen, B.; Carreras, B.; García, L.; Nicolau, J. The Radial Propagation of Heat in Strongly Driven Non-Equilibrium Fusion Plasmas. Entropy 2019, 21, 148.

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